Determine the nickel content in 200 ml of solution, if the following results were obtained during photometric titration in an ammonia solution of 0.2051 N Trilon B solution:
V, ml 0 1 2 3 4 5 6 7
A 0.67 0.53 0.38 0.25 0.20 0.13 0.05 0.05

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